// Copyright 2022 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.

import {
  keymap,
  highlightSpecialChars,
  drawSelection,
  highlightActiveLine,
  dropCursor,
  rectangularSelection,
  crosshairCursor,
  highlightActiveLineGutter,
} from '@codemirror/view';
import { Extension, EditorState } from '@codemirror/state';
import {
  defaultHighlightStyle,
  syntaxHighlighting,
  indentOnInput,
  bracketMatching,
  foldGutter,
  foldKeymap,
} from '@codemirror/language';
import { defaultKeymap, history, historyKeymap } from '@codemirror/commands';
import { searchKeymap, highlightSelectionMatches } from '@codemirror/search';
import {
  autocompletion,
  completionKeymap,
  closeBrackets,
  closeBracketsKeymap,
} from '@codemirror/autocomplete';
import { lintKeymap } from '@codemirror/lint';

const defaultKeymapMinusEnterAndArrowUpDown = defaultKeymap.map((keymap) => {
  if (keymap.key === 'Enter') {
    return { ...keymap, key: 'Shift-Enter' };
  }
  if (keymap.key === 'ArrowUp') {
    return { ...keymap, key: 'Shift-ArrowUp' };
  }
  if (keymap.key === 'ArrowDown') {
    return { ...keymap, key: 'Shift-ArrowDown' };
  }
  return keymap;
});

export const basicSetup: Extension = (() => [
  highlightActiveLineGutter(),
  highlightSpecialChars(),
  history(),
  foldGutter(),
  drawSelection(),
  dropCursor(),
  EditorState.allowMultipleSelections.of(true),
  indentOnInput(),
  syntaxHighlighting(defaultHighlightStyle, { fallback: true }),
  bracketMatching(),
  closeBrackets(),
  autocompletion(),
  rectangularSelection(),
  crosshairCursor(),
  highlightActiveLine(),
  highlightSelectionMatches(),
  keymap.of([
    ...closeBracketsKeymap,
    ...defaultKeymapMinusEnterAndArrowUpDown,
    ...searchKeymap,
    ...historyKeymap,
    ...foldKeymap,
    ...completionKeymap,
    ...lintKeymap,
  ]),
])();
